Intrahepatic bile duct adenoma (peribiliary gland hamartoma): a case report and review of literature.

Bile duct adenoma (BDA) is a comparatively rare disease and there are relatively few reported cases in the English-language literature. Herein, we present a 63-year-old woman, who was incidentally found to have a liver-occupying lesion during a routine medical examination. Ultrasonography suggested "quick wash-in and wash-out" sign with an obvious nodular enhancement in the peripheral of the right intrahepatic nodular. Computed tomography revealed a 33 mm×25 mm×28 mm mass in the right hepatic segment. The patient underwent a liver tumor resection. Histological examination showed that the tumor was consisted of small heterogeneous tubular ducts with fibrous tissues and several inflammatory cells, without cell atypia and mitotic activity. Immunohistochemically, the tumor cells were positive for CK19, CK7, CD56 and CD10. The final histopathological diagnosis was intrahepatic BDA.